CNC 3018 Pro - grblControl unknown error

[boo1]

Hello,

I am new to this, i have a CNC 3018 pro.
I was using spindle first time with grblControl 1.1h, everything was ok.
I Connect laser and again everything was ok.
The problem it s when i try to put back the spindle and use it, it give me error UNKNOWN in grblControl.

Any ideea about this? I have try plenty settings for $$.

Thank you very much for help!

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